Creator of the Kick Ass comics, Mark Millar, has posted this about how they had the first contact with Jim Carrey:

Matthew Vaughn, Jeff Wadlow and I did a conference call with Jim a couple of weeks back and we've been itching to talk about this ever since because the energy Jim's going to bring to Colonel Stars has me buzzing as much as Nic Cage with Big Daddy. You have to remember that Big Daddy's role before Cage came on was a much more straightforward bad-ass. It was Nic who gave him that Adam West delivery and brought this incredible warmth to the character, especially with regard to Mindy.

Nic is really good friends with Jim Carrey and it's well known to everyone that Jim loved the first movie. In fact, I think he had lunch with Vaughn the day before that Conan O'Brien kick-Ass/ Superman duet you can see in the link. So we've been talking very informally about this for a little over two years now. We didn't quite know what Jim was going to be doing in the sequel, but the entire team loves him to bits and I've been a fan since I first saw him. I remember reading an interview with Spielberg, a great one back in Empire for a JAws anniversary, where he was saying that Jim would be his choice for Chief Brodie were he shooting Jaws now. He said he could see the brilliant dramatic range Jim had as well as the comedy people knew him for at that time. For all these reasons, combined with the conversation we had with him on the phone, I'm so genuinely excited about this. I can't wait to see what he does once the cameras are on.

Some of it has already been shot at pinewood in the UK Sam Taylor wood's new young husband said this week he had shot his bits there...... no we want James to come to UK Pinewood and shoot his stuff too. If not hope he comes on the promo next July

Kick-Ass, Hit Girl and Red Mist return for the follow-up to 2010's irreverent global hit: Kick-Ass 2. After Kick-Ass' (Aaron Taylor-Johnson) insane bravery inspires a new wave of self-made masked crusaders, led by the badass Colonel Stars and Stripes (Jim Carrey), our hero joins them on patrol. When these amateur superheroes are hunted down by Red Mist (Christopher Mintz-Plasse)—reborn as The Mother F%&*^r—only the blade-wielding Hit Girl (Chloë Grace Moretz) can prevent their annihilation.

When we last saw junior assassin Hit Girl and young vigilante Kick-Ass, they were trying to live as normal teenagers Mindy and Dave. With graduation looming and uncertain what to do, Dave decides to start the world's first superhero team with Mindy. Unfortunately, when Mindy is busted for sneaking out as Hit Girl, she's forced to retire—leaving her to navigate the terrifying world of high-school mean girls on her own. With no one left to turn to, Dave joins forces with Justice Forever, run by a born-again ex-mobster named Colonel Stars and Stripes.

Just as they start to make a real difference on the streets, the world's first super villain, The Mother F%&*^r, assembles his own evil league and puts a plan in motion to make Kick-Ass and Hit Girl pay for what they did to his dad. But there's only one problem with his scheme: If you mess with one member of Justice Forever, you mess with them all.